TEMP: Conference workshop demonstration branch#1672
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Adds a new ``frontend-plugin-framework`` plugin slot, ``org.openedx.frontend.authn.register.additional_fields.v1``, in ``RegistrationPage``. The slot is positioned just above the submit button so plugins can append optional fields (e.g. demographics, institutional affiliation, role) without modifying the form's core required-fields layout. Why a slot here, and why "additional_fields"? * Several deployments already maintain forks of ``RegistrationPage`` to inject extra fields. Forking the authn MFE is a well-known pain point — the slot replaces a class of long-lived forks with a single documented extension point. * "additional_fields" deliberately scopes the slot to *learner-supplied optional input*, not to layout chrome (links, banners, marketing copy). Layout-level extension is better served by separate slots with simpler contracts. * The slot exposes ``formFields`` (current form values) and ``setFormField(name, value)`` so plugin components participate in the existing form-state machinery instead of maintaining shadow state and submitting via a side channel. This change is additive: with no plugin registered, the slot renders nothing and the form is byte-identical to today. Companion server-side changes: - openedx-events: ``REGISTRATION_DEMOGRAPHICS_CAPTURED`` (#NNNN) - edx-platform: fire the event from the authn registration view (#NNNN) Reference: OEX 2026 workshop "Leveraging Open edX Extension Points", Section 4.
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Description
This is a demonstration PR for the Open edX conference talk "Extending Open edX". It is designed to showcase adding a new plugin slot to an MFE, but it not intended to be merged.